'Not found' message when I try to install Indexhibit

Hello,
I'm following Tutorials and Demo and everything (database, web root, etc) is ok until I arrive to 'Install Indexhibit'; when I write 'javieraristu.com/ndxzstudio/install.php' appears this message: 'Not Found — The requested URL /ndxzstudio/install.php was not found on this server — Apache/2.2.22 Server at javieraristu.com Port 80'